HEMEROBIUS. HEMEROBIUS. 
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Generic Character. 
Os dentibus duobus; Palpis 
quatuor. 
Stemmata nulla. 
Ala deflexae (nec plicatae.) 
Antenna thorace convex o 
longiores, setaceae, por- 
rectae. 
Mouth with two teeth, and 
four Feelers. 
Stemmata none. 
Wings deflected, not pleat- 
ed. 
Antenna longer than the 
convex thorax, setace- 
ous, stretched forwards. 
TThE genus Hemerobius is distinguished by a 
peculiar delicacy of appearance. The most com- 
mon species, the Hemerobius Perla, is an insect 
of extreme beauty. It is principally seen in the 
middle and towards the decline of summer, and is 
a slender-bodied fly of a grass-green colour, with 
bright gold-coloured eyes, and four large, trans- 
parent, oval wings finely reticulated with pale- 
green veins. The general length of the animal, 
from the head to the tips of the wings, is about 
three quarters of an inch. It is not uncommon 
in the neighbourhood of gardens, occasionally 
flying into houses. If pressed or bruised it dif- 
fuses an odour of the most disagreeable kind, and 
V. VI. p. II. 17 
